Splitting datetime into date/year/month/dayname and count year - sql

Question

I got question to split date, month year, dayname from datetime by using trigger, when I insert a datetime, then in next column will split date, time, month year dayname and count year (to know how old the man in my data) is that possible ?
For example, if I insert
INSERT INTO MAN VALUES ('04/06/1982')
then will be like this
DATETIME DATE MONTH YEAR DAYNAME AGE
04/06/1982 00:00:00 04 06 1982 friday 27

Answer 1

Try this :-
Declare #myDate datetime
set #myDate='19820604' --YYYYMMDD
Select #myDate as DateTime,
datename(day,#myDate) as Date,
month(#myDate) as Month,
datename(year,#myDate) as Year,
Datename(weekday,#myDate) as DayName,
DATEDIFF ( year , #myDate , getdate() ) as Age
Result
╔══════════════════════════════╦══════╦═══════╦══════╦═════════╦══════════╗
║ DateTime ║ DATE ║ MONTH ║ YEAR ║ DAYNAME ║ Age ║
╠══════════════════════════════╬══════╬═══════╬══════╬═════════╬══════════╣
║ April, 06 1982 00:00:00+0000 ║ 4 ║ 6 ║ 1982 ║ Friday ║ 31 ║
╚══════════════════════════════╩══════╩═══════╩══════╩═════════╩══════════╝
SQL Fiddle Demo

Answer 2

The code has been slightky altered to give the age correctly.
Select myDate,myDateDate,myDateMonth,myDateYear,myDateDayName, Convert(varchar(50),Age)+ ' Years and '+Convert(varchar(50),nodays) +'days' {Age] from
(
Select #myDate as myDate,
datename(day,#myDate) as myDateDate,
month(#myDate) as myDateMonth,
datename(year,#myDate) as myDateYear,
Datename(weekday,#myDate) as myDateDayName,
DATEDIFF ( year , #myDate , getdate() ) Age ,
DATEDIFF ( dd , #myDate , getdate() ) -365* DATEDIFF ( year , #myDate , getdate() ) as nodays
) As a
Thanks
Arun

Answer 3

Here there are two approaches for solving the issue:
- Approach 1:
you can add some computed columns in to your table, so when you retrieve the table contents the other remaining fields are computed in that time.
-- 1.1) Create the base of table 'MAN'
CREATE TABLE [dbo].[MAN](
[DATETIME] [datetime] NOT NULL
) ON [PRIMARY]
GO
-- 1.2) Insert a record in it
INSERT INTO MAN VALUES ('04/06/1982')
GO
-- 1.3) Add some computed columns
ALTER TABLE MAN
ADD
[DAY] AS DATENAME(DAY, [DATETIME]),
[MONTH] AS MONTH([DATETIME]),
[YEAR] AS DATENAME(YEAR, [DATETIME]),
[DAYNAME] AS DATENAME(WEEKDAY, [DATETIME]),
[AGE] AS DATEDIFF(YEAR, [DATETIME], GETDATE())
GO
-- 1.4) See the result
SELECT * FROM MAN
- Approach 2:
While you creating the table, you add the remaining fields that you need, so that in the next phase you add insert/update triggers in order to calculate the remaining fields and insert/update them.
-- 2.1) Create the table 'MAN' with all needed columns
CREATE TABLE [dbo].[MAN](
[DATETIME] [datetime] NOT NULL,
[DAY] [int] NULL,
[MONTH] [int] NULL,
[YEAR] [int] NULL,
[DAYNAME] [nvarchar](10) NULL,
[AGE] [int] NULL
) ON [PRIMARY]
GO
-- 2.2) Create Insert and update triggers in order to calculate the values of the rest fields while inserting/updating
CREATE TRIGGER [dbo].[trCalculateRemainingDateFields] ON MAN
AFTER INSERT, UPDATE
AS
BEGIN
SET NOCOUNT ON;
UPDATE MAN
SET
[DAY] = DATENAME(DAY, MAN.[DATETIME]),
[MONTH] = MONTH(MAN.[DATETIME]),
[YEAR] = DATENAME(YEAR, MAN.[DATETIME]),
[DAYNAME] = DATENAME(WEEKDAY, MAN.[DATETIME]),
[AGE] = DATEDIFF(YEAR, MAN.[DATETIME], GETDATE())
FROM Inserted i
WHERE i.[DATETIME] = MAN.[DATETIME]
END
GO
-- 2.3) Insert a record in it
INSERT INTO MAN ([DATETIME]) VALUES ('04/06/1985')
GO
-- 2.4) See the result
SELECT * FROM MAN
- Approach 3:
Creating a view of the main table which calculate the remaining fields can be a good option.
-- 3.1) Create the base of table 'MAN'
CREATE TABLE [dbo].[MAN](
[DATETIME] [datetime] NOT NULL
) ON [PRIMARY]
GO
-- 3.2) Insert a record in it
INSERT INTO MAN VALUES ('04/06/1982')
GO
-- 3.3) Create a view which is contained the remaining fields
CREATE VIEW dbo.vMAN
AS
SELECT [DATETIME],
DATENAME(DAY, [DATETIME]) AS [DAY],
MONTH([DATETIME]) AS [MONTH],
DATENAME(YEAR, [DATETIME]) AS [YEAR],
DATENAME(WEEKDAY, [DATETIME]) AS [DAYNAME],
DATEDIFF(YEAR, [DATETIME], GETDATE()) AS [AGE]
FROM MAN
GO
-- 3.4) See the result
SELECT * FROM vMAN